Tube-expander



A. H. IHSEN.

TUBE EXPANDER. APPLICATION mm MAY 29. 1919.

Patented 00's. 26, 1920.

INVENTOR UNITED STATES ARTHUR H. IHSEN, 0F PITTSBURGH, PENNSYLVANIA.

TUBE-EXPANDER.

Specification of Letters Patent. Patented Oct. 26, 1920.

Application filed Ma ne, 1919. Serial No. 300,651.

To all whom it may concern Be it known that I, ARTHUR H. IHsEN, of the city of Pittsburgh, in the county of {X1 legheny and State of Pennsylvania, have invented a certain new and useful Improvement in Tube-Expanders, of which the following is a full, clear, and exact description, reference being had to the accompanying drawing, formingpart'of thisfspecification, in which Figure 1 is a side elevation of a tube expander having my improvement, the guard being in section to show the casing; Fig. 2 is a like view, the casing being shownin section; Fig. 8 is a cross section on the line of Fig. 2 Fig. 4 is an end view of the spring retaining collar detached from the casing; Fig. 5 is a side view of the same;

and Fig. 6 is a view of one of the rollers detached.

In expanders for expanding or flaring the ends of'small tubes it is impossible to properly contract the casing about the expanding rollers to retain them in position, and the addition of a retaining device has been necessary. But these devices, now in use, have more or less interfered with the move ment of the rollers. vention, therefore, is to provide a retaining device for holding the rollers in place in the casing free to rotate and to move radially to expand the tube.

In the drawing a a casing having slots Z) in which rest the expanding rollers c on the tapered rod (Z, which passes through the bore ofthe casing, and by theadvancement of which the rollers c areforced outwardly in the slots Z) against that portion of the inner circumference of the tube which is to be expanded. rollers c, which are usually three in number,

The object of my in-- This outward movement of the the rollers beyond the outer face of the cas- I tli escape of the rollers from the slots when the expander is removed from the tube, and

this device consists ofa collar e, which is preferably split longitudinally, as at i, and is provided with resilient tongues 7, the ends of which, when the collar is fitted around the casing, bear on the rollers 0 sufficiently to prevent their escape from the slots 7). The collar 7 is secured to the casing by a screw h, which, however, does'not interfere with the force of the spring produced by the split in the collar, which with the spring of thetongues f exerts a yielding pressure on the rollers. Q t

From this description the advantages of my invention should be appreciated by those skilled in the art to which it appertains.

Having thus described my invention, what 'I claim and desire to secureby Letters Patent isi In a tube expander, the combination of a casing having longitudinal recesses,rollers necessitating also a device. to prevent] fitting within the recesses, a tapered rod fitting within the bore of the casing and bearing against the rollers, a housing secured to said casing and inclosing the rear ends of said rollers, and a collar mounted on the casing within said housing and having itnessesr ESTELLE MARTIN, JAIQIEE K. BAKnwnL ARTHUR H. nisnN; p 

